21044713 has 4 divisors (see below), whose sum is σ = 21066580. Its totient is φ = 21022848.

The previous prime is 21044711. The next prime is 21044717. The reversal of 21044713 is 31744012.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 14953689 + 6091024 = 3867^2 + 2468^2 .

It is a cyclic number.

It is not a de Polignac number, because 21044713 - 2¹ = 21044711 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (21044711) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9420 + ... + 11437.

It is an arithmetic number, because the mean of its divisors is an integer number (5266645).

Almost surely, 2^21044713 is an apocalyptic number.

It is an amenable number.

21044713 is a deficient number, since it is larger than the sum of its proper divisors (21867).

21044713 is a wasteful number, since it uses less digits than its factorization.

21044713 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21866.

The product of its (nonzero) digits is 672, while the sum is 22.

The square root of 21044713 is about 4587.4516891189. The cubic root of 21044713 is about 276.0880880000.

Adding to 21044713 its reverse (31744012), we get a palindrome (52788725).

The spelling of 21044713 in words is "twenty-one million, forty-four thousand, seven hundred thirteen".